I'm not sure if it's the same on Solaris, but on Linux arping -D ... is used (Duplicate address detection mode (DAD). See RFC2131, 4.4.1.).
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Cristian CiupituSep 17 '10 at 7:48

@Cristian Ciupitu: Thanks, did not know this flag ;) On my debian lenny system (arping 2.07~pre1-2) the flag is lowercase
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krissiSep 17 '10 at 8:24

Fedora 13 uses the arping from iputils-20071127-12, not this one which seems to be the one used by Debian Lenny. By the way the exact command used by my ifup-eth script is arping -q -c 2 -w 3 -D -I ${REALDEVICE} ${IPADDR}.
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Cristian CiupituSep 17 '10 at 19:36